单项选择题

So little () about mathematics that the lecture was completely beyond me.

A. I knew
B. do I know
C. did I know
D. have I known

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Hardly()when it began to rain.

A. had he arrived
B. arrived he
C. he had arrived
D. did he arrive
单项选择题
She told her little brother () her hand tightly while they were crossing the busy street.

A. hold on to
B. holding on to
C. held on to
D. to hold on to
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